Use the method of substitution to solve the following pairs of simultaneous equations 1. y=2x-4 and 3x + y = 11
2. a=5-2b and 5a + 2b =1
3. 2m+n=0 and m+2n=3
4. x+y=4 and 2x-y= 5
5. y-2x=1 and 3x-4y=1

answer: two angles are called supplementary if they add up to 180°. example: the two angles (140° and 40°) are supplementary because they add up to 180°.

step-by-step explanation:

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true

whole number data type

step-by-step explanation:

as whole number type represents whole number

like 1, 2 ,3, 4

in other words the whole numbers are those numbers which cannot be written infraction.

since we can take days as a whole number i.e 1 day 2 day and we cannot write 1.2 day hence we will use whole number data type