- 7th Grade Work - The side lengths of a triangle are given by the expressions 7x – 3, 9x – 3, and 9x – 4. Write and simplify a linear expression for the perimeter of the triangle.

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!