Line l1, l2 and l3 are in the same plane, l1 is perpendicular to l2, and l3 is parallel to l1. which of the following statement must be true? 1. l3 is parallel to l2 2.l3 is perpendicular to l2 3.l3 intersects l2

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?